Information. That is, the RIGHT information.

Actually talk about the problem you solve that your client can't - AND - the result they are looking for, so that they might think you care more about them than you do yourself. 

That's not aimed specifically at you, it IS aimed at all marketers who attempt to sell ANYTHING online. Social media AND websites are full of blather about what you do, about yourself - and there is NOTHING about the client's problem and the result THEY are looking for. 

Big corporations have billions to pour into their marketing. I'm guessing you aren't them. So  you have to use real marketing, that works, and you have to start by talking about your client's problems, and the results they are looking for. 

Here's a short video that will show you more about how to market than you'd learn if you got an MBA - http://45MinuteMarketing.club/wrong